Swimming Upstream: Computational Hydrodynamics of Trout Locomotion

Swimming Upstream: Computational Hydrodynamics of Trout Locomotion Yan Ren, University of Virginia Geng Liu, University of Virginia Pan Han, University of Virginia Haibo Dong, University of Virginia Valentina Di Santo, Harvard University George Lauder, Harvard University DOI: Trout is thought to be one of the fresh water fish that can swim at a high propulsive efficiency. The unsteady vortex dynamics is key to understand the hydrodynamics of trout swimming. Here we present an integrated approach combining highspeed photogrammetry, surface reconstruction, and direct numerical simulations to study the threedimensional vortex dynamics of a trout in both steady swimming and burstcoast. The trout body model is comprised of a trunk, a dorsal fin, an anal fin, and a caudal fin. The undulatory motion of the model is reconstructed based on highspeed videos from three orthogonal views. The vortex dynamics of both steady swimming and burstcoast is visualized by thre